Vol. 12, Issue 12 (2023)

Author(s):
Swaroop KO, Sajjanar GM, Sneha SP, Kiran BO and Soregaon CD

Abstract:
The present investigation was carried out during rabi season 2021–22 with 32 elite sorghum genotypes including hybrid parents and check varieties to study their response under different temperature regimes on seed set percentage and pollen fertility percentage. The experimental material was evaluated over four dates of sowing (September-November), at an interval of fortnight as to adjust flowering at different temperature regimes. The experiment was laid out in a randomized block design with two replications. The study revealed that the range of pollen fertility percentage was higher than the range of seed set percentage in all the dates of sowing and temperature regimes. In other words, seed set percentage is more affected by temperature at all the four dates compared to pollen fertility. In general, seed setting percentage was higher in both first and second dates (>90%) compared to third and fourth dates. The effect of sowing dates on different phenotypic characters also revealed that delayed sowing, i.e., on the third and fourth dates of sowing, reduced the expression of all traits studied. In terms of grain yield per plant, the second date (October first week) sown plants yielded more than the remaining dates. Comparative mean performance of B lines for various reproductive traits across different dates with that of R lines, revealed lower mean performance of B lines for all the reproductive characters except grain number.